Consider the following heat engines operating between 1200K and 300 K. For each case determine whether the heat engine operates reversibly, operates irreversibly, or is impossible. a. QH = 850 kJ, Qc = 300 kJ, Wnet = 550 kJ, b. QH = 900 kJ, Qc = 400 kJ, Wnet = 550 kJ, %3D c. QH = 700 kJ, Qc = 140 kJ, Wnet = 560 kJ, %3D d. QH = 800 kJ, Qc = 200 kJ, Wnet = 600 kJ. %3D

Consider the following heat engines operating between 1200K and 300 K. For each case determine whether the heat engine operates reversibly, operates irreversibly, or is impossible. a. QH = 850 kJ, Qc = 300 kJ, Wnet = 550 kJ, b. QH = 900 kJ, Qc = 400 kJ, Wnet = 550 kJ, %3D c. QH = 700 kJ, Qc = 140 kJ, Wnet = 560 kJ, %3D d. QH = 800 kJ, Qc = 200 kJ, Wnet = 600 kJ. %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A heat engine is supplied with 278 kJ/s of heat at a constant 6fixed temperature of 283°C and the heatrejection takes place at 5°C. The following results werereported: (i) 208 kJ/s are rejected, (ii) 139 kJ/s arerejected, (ii) 70 kJ/s are rejected.Classify which of the results report a reversible cycle orirreversible cycle or impossible results.
A refrigeration cycle draws heat (Q C ) from the cold well at T C =280K, while the hot well at T H =320K dissipates heat to the source. Check whether the cycle works for each of the following conditions. Please specify. Determine if the cycle is reversible, irreversible, or impossible. a) Qc=1500 kJ, Wcycle =150 kJ. b) Qc = 1400 kJ, Qh =1600 kJ. c) Qh =1600 kJ, Wcycle = 400 kJ. d) COPsm = 5.
For an air conditioner, if QH = 600.00 kJ, and QL = 350.00 kJ, then the coefficient of performance COPAC is ____________
2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%
An existing steady state refrigerator has been operating using the vapor-compression cycle for some months, with a COP of 3.1. Today the rate at which work is being added to the compressor is the same, but QC has decreased. Which of the following statements must be true? a. The new COP must be higher. b. QH must be larger in magnitude than normal. c. QH must be smaller in magnitude than normal. d. The compressor efficiency is lower than normal.
Part C only A gas-turbine power generator operates on an ideal air-standard Brayton cycle 1 → 2 → 3 → 4 shown in Fig. 1. The gas temperatures at the compressor inlet, compressor exit, and turbine inlet are T1 = 300 K, T2 = 600 K, and T3 = 1200 K, respectively. Solve Part C below using the variable specific heat assumption. Part C - Determine the heat input qin in the process 2 → 3, the work wC used by the compressor, and the work wT produced by the turbine per kg of air.
PART B ONLY A gas-turbine power generator operates on an ideal air-standard Brayton cycle 1 → 2 → 3 → 4 shown in Fig. 1. The gas temperatures at the compressor inlet, compressor exit, and turbine inlet are T1 = 300 K, T2 = 600 K, and T3 = 1200 K, respectively. Solve the problem below using the variable specific heat assumption. PART B - Determine the pressure ratio rp = P2/P1 and the temperature at the turbine exit, T4 (in K).
Rannkin cycle 1_The value of enthalpy at point 1 is ( h1 =?) 2_ value of enthalpy at point 2 is ( h2 =?) 3_ value of enthalpy at point 3 is ( h3 =?) 4_value of enthalpy at point 4 is ( h4 =? 5_ value of steam mass flow rate in kg/s is 6_rate of heat supplied7_ power developed by Turbine (WT) in kW is : 8_ Thermal efficiency of Rankine cycle is:
True or false Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient electrical resistance heater. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the cheap commercial heat pump. Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient isothermal heat source. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the isothermal heat source.
A Carnot engine operating between 527C and 27 C produces 600KW of work. Determine, (a) Qa, KW; (b) Qr, KW; (c) ΔS during heat rejection, KW/K and (d) thermal efficiency of the cycle. (Please provide complete solution and write legibly.)
The maximum thermal efficiency possible for a power cycle operating between 1200 F and 225 F is
Two reversible cycles operate between hot and cold reservoirs at temperatures TH and TC, respectively. (a)If one is a power cycle and the other is a refrigeration cycle, what is the relation between the coefficient of performance of the refrigeration cycle and the thermal efficiency of the power cycle? (b)If one is a refrigeration cycle and the other is a heat pump cycle, what is the relation between their coefficients of performance?